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I'm developing a Dapp using truffle and I need to connect to a contract that I uploaded on rinkeby using truffle migrate --network rinkeby. Problem is that I'm unable to connect to the rinkeby network from the web3 interface. I run a rinkeby local node using 

geth --rinkeby --rpc --rpcapi db,eth,net,web3,personal --rpcport 8545 --rpcaddr localhost --rpccorsdomain "*" --unlock="0x4A1b47b0b119AFD421ec4E3b5B54D8EF5141b59c"

The front-end code is

if (typeof web3 !== 'undefined'){
        web3 = new Web3(web3.currentProvider);
    }else{
        web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
  }

But the code always slaps me with 

Error: Provider not set or invalid.

How can I resolve this issue and how to create a new contract instance from contract abi?

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2
  • have you tried --rpcaddr 0.0.0.0? this has worked for me in the past though I can't remember why, hence the comment instead of a full answer!
    – TC8
    Commented Mar 15, 2018 at 9:13
  • Have you set the provider in the truffle.js file? If not here is the code rinkeby: { host: "localhost", port: 8545, network_id: 4, from: "address", gas: gas }
    – Gabe
    Commented Mar 15, 2018 at 10:47

1 Answer 1

Reset to default
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Dapp using truffle and local server this commend run: 

geth --rinkeby --rpc --rpcapi db,eth,net,web3,personal --rpcport 8545 --rpcaddr "http://localhost:8000" --rpccorsdomain "*" --unlock="0x4A1b47b0b119AFD421ec4E3b5B54D8EF5141b59c"

and try it http://localhost:8000

Rpc domain --rpc --rpccorsdomain "http://localhost:8000" then run project

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6
  • It is not working either.
    – Uchiha Madara
    Commented Feb 10, 2018 at 7:47
  • I tried this geth --rinkeby --rpc --rpcapi db,eth,net,web3,personal --rpcport 8545 --rpcaddr localhost --rpccorsdomain "http://localhost:8000" --unlock="0x4A1b47b0b119AFD421ec4E3b5B54D8EF5141b59c". Please correct me if I'm wrong.
    – Uchiha Madara
    Commented Feb 10, 2018 at 7:59
  • geth --networkid 20 --port 60303 --rpc --rpccorsdomain "localhost:8000" --lightkdf --cache 16 --datadir "D:\Database\final_chain_database" console this commend run and genesis file inti then this commend run then "npm start "
    – ALOMGIR HOSSEN
    Commented Feb 10, 2018 at 8:26
  • The problem persists. I would like to hear what is going wrong here, then explain to me how I can fix the problem.
    – Uchiha Madara
    Commented Feb 10, 2018 at 8:43
  • What version of web3? 95% of the issues I've been having recently are due to the breaking changes between v0.x and v1.0(which is now installed by default). If your web3 version is v1.x try switching to v0.20.x or v0.19.x. The way you have the front end code the v1 will most likely fail (trust me, been a month long headache haha)
    – ryanh
    Commented Feb 10, 2018 at 20:03

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